linux-kernel - Re: [PATCH] virtio: set pci bus master enable bit

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Message-Id: <200912011034.02251.rusty@rustcorp.com.au>
Date:	Tue, 1 Dec 2009 10:34:01 +1030
From:	Rusty Russell <rusty@...tcorp.com.au>
To:	"Michael S. Tsirkin" <mst@...hat.com>
Cc:	Mark McLoughlin <markmc@...hat.com>, linux-kernel@...r.kernel.org,
	virtualization@...ts.linux-foundation.org,
	Anthony Liguori <anthony@...emonkey.ws>, kvm@...r.kernel.org,
	Yan Vugenfirer <yvugenfi@...hat.com>,
	Jesse Barnes <jbarnes@...tuousgeek.org>
Subject: Re: [PATCH] virtio: set pci bus master enable bit

On Mon, 30 Nov 2009 02:22:01 am Michael S. Tsirkin wrote:
> As all virtio devices perform DMA, we
> must enable bus mastering for them to be
> spec compliant.
> 
> Signed-off-by: Michael S. Tsirkin <mst@...hat.com>
> ---
>  drivers/virtio/virtio_pci.c |    1 +
>  1 files changed, 1 insertions(+), 0 deletions(-)
> 
> diff --git a/drivers/virtio/virtio_pci.c b/drivers/virtio/virtio_pci.c
> index 28d9cf7..717bae1 100644
> --- a/drivers/virtio/virtio_pci.c
> +++ b/drivers/virtio/virtio_pci.c
> @@ -648,6 +648,7 @@ static int __devinit virtio_pci_probe(struct pci_dev *pci_dev,
>  		goto out_req_regions;
>  
>  	pci_set_drvdata(pci_dev, vp_dev);
> +	pci_set_master(pci_dev);

I can believe this, but I have no idea if it's right.  I've applied it, and
hope Jesse will comment if there's something wrong with it.

Thanks,
Rusty.
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